Genian NAC V4.0: Improper Authentication
CVE-2023-40253 is a critical-severity improper authentication vulnerability in Genian NAC V4.0 from Genians, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Genian NAC V4.0 versions: V4.0.0 through V4.0.155. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.42% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update Genian Nac to 4.0.156 or 5.0.55, whichever matches your release line, or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Genians | Genian NAC V4.0 | V4.0.0 through V4.0.155 | Not stated |
| Genians | Genian NAC V5.0 | V5.0.0 through V5.0.42 (Revision 117460) | Not stated |
| Genians | Genian NAC Suite V5.0 | V5.0.0 through V5.0.54 | Not stated |
| Genians | Genian ZTNA | V6.0.0 through V6.0.15 | Not stated |
| Genians | Genian Nac | 4.0.0 up to, but not including, 4.0.156; 5.0.0 up to, but not including, 5.0.55; 5.0.42 | 4.0.156, 5.0.55 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 6.0 | Medium | CNA (krcert.or.kr) |
| CVSS 3.1 | 9.8 | Critical | NVD |
Official description
Improper Authentication vulnerability in Genians Genian NAC V4.0, Genians Genian NAC V5.0, Genians Genian NAC Suite V5.0, Genians Genian ZTNA allows Authentication Abuse.This issue affects Genian NAC V4.0: from V4.0.0 through V4.0.155; Genian NAC V5.0: from V5.0.0 through V5.0.42 (Revision 117460); Genian NAC Suite V5.0: from V5.0.0 through V5.0.54; Genian ZTNA: from V6.0.0 through V6.0.15.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
How developers prevent this class of flaw
- Use an authentication framework or library such as the OWASP ESAPI Authentication feature.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in Genian NAC V4.0
- 8.7 High severity
- 9.8 Critical severity
- 9.8 Critical severity
Recent Improper Authentication vulnerabilities
- 9.1 Critical severity
- 9.1 Critical severity
- 7.5 High severity
- 8.2 High severity
- 9.4 Critical severity
- 8.8 High severity
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